Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <blockquote> <p>Is there any difference between those two?</p> </blockquote> <p>One major difference is that in the second case using <em>new</em>, the returned object has an additional object on it's <code>[[Prototype]]</code> chain that is the public prototype of the constructor function expression. That object can be accessed in some browsers using <code>__proto__</code>.</p> <p>Also, <code>myObject1.constructor</code> is the built–in Object function, while <code>myObject2.constructor</code> is the function created by the function expression.</p> <blockquote> <p>Are there any other possibilities to implement private members?</p> </blockquote> <p>I suppose you could use the object's (otherwise useless) <code>__proto__</code> object, but that's more obfuscation than privacy (and not available in some browsers):</p> <pre><code>var foo = new function() { this.__proto__.privateMember = 42; this.publicMember = function() { return this.__proto__.privateMember; } }; alert(foo.publicMember()); </code></pre> <p>Pretty ugly really.</p> <p>Closures have been used to emulate private members in javascript for quite some time (more than 10 years at least) but there hasn't been any real pressure to include them in ECMA-262 (as far as I'm aware). I suppose that indicates that private members are handy, but not critical to implement functionality required for the type of host environment scripting that javascript is typically used for.</p> <h3>Edit</h3> <p>As Bergi says, the ES5 <a href="http://www.ecma-international.org/ecma-262/5.1/#sec-15.2.3.2" rel="nofollow"><em>Object.getPrototypeOf</em></a> method should be used in stead of the (non standard) <a href="https://developer.mozilla.org/en/docs/JavaScript/Reference/Global_Objects/Object/proto" rel="nofollow"><code>__proto__</code></a> property. My bad for no pointing that out initially.</p>
    singulars
    1. This table or related slice is empty.
    1. POTechnical differences in creating object with private member
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USRobG
    1. USRobG
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COsee my updated answer: both objects seem to have `this.__proto__.constructor`; the `__proto__` is different since `function` prototype is different to object literal `{}` prototype, which is `Object`.
      singulars
      1. PO
      1. USJan Turoň
    2. COI updated my answer. The `__proto__.constructor` in both cases is Object, it's the returned object's constructor that is different.
      singulars
      1. PO
      1. USRobG
    3. COI don't see why "private" members on the prototype were either private or obfuscating anything (other then the creation code). You still can get and set `foo.privateMember`
      singulars
      1. PO
      1. USBergi
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload